<!DOCTYPE HTML>
<html>

<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
	<title>下拉菜单</title>
	<style>
		.dropbtn {
			background-color: #4CAF50;
			color: white;
			padding: 16px;
			font-size: 16px;
			border: none;
			cursor: pointer;
		}

		.dropdown {
			position: relative;
			display: inline-block;
		}

		.dropdown-content {
			display: none;
			position: absolute;
			background-color: #f9f9f9;
			min-width: 160px;
			box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
		}

		.dropdown-content a {
			color: black;
			padding: 12px 16px;
			text-decoration: none;
			display: block;
		}

		.dropdown-content a:hover {
			background-color: #f1f1f1
		}

		.dropdown:hover .dropdown-content {
			display: block;
		}

		.dropdown:hover .dropbtn {
			background-color: #3e8e41;
		}
	</style>
</head>

<body>
	<h1>下拉菜单</h1>
	<div class="dropdown">
		<button class="dropbtn">下拉菜单</button>
  <div class="dropdown-content">
    <a href="/index.html">1</a>
    <a href="/index.html">2</a>
    <a href="/index.html">3</a>
  </div>
</div>
</body>

</html>